What you need to get is bulletin number RG14660. Installation instructions for cylinder head assembly 6362,6404,6466 or 6076 engines it will be 11 pages of info on headgaskets and installation according to serial number of engine. tried to take a picture of it but it looks a little fuzzy ,will put it up anyway. anybody else that has a 466 should get this bulletin to have on hand. Instructions come with the kit but knowing beforehand whats going on helps a lot.
 (466 headgasket 2.jpg)
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 466 headgasket 2.jpg (34KB - 266 downloads)
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4450 head gasket seeping
